Microwell Array Screening for Antigen-Specific Cells
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Solution Overview
Problem
Conventional methods for screening antigen-specific antibody-producing hybridomas are inefficient, as they require manual detection of antigen specificity in individual lymphocytes, which is difficult due to low frequency and low antibody production, and lack a method for simultaneous measurement of large numbers of cells, leading to challenges in real-time detection and recovery of target cells.
Innovation Solution
A microwell array with a coating layer capable of binding to substances produced by cells, allowing for simultaneous culture and detection of immunoglobulin-producing or cytokine-producing cells, enabling the identification of target cells through label substances that bind specifically to produced substances, facilitating the recovery of specific immunoglobulin-producing or cytokine-producing cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual detection of antigen specificity in individual lymphocytes is performed, then detection precision can be achieved, but productivity is extremely low due to the difficulty and time-consuming nature of the process
Solution Approach 1:
The invention divides the detection task into two segments: first, high-throughput screening of hybridoma clones using automated methods to identify potential positive wells; second, manual verification of antigen specificity only for selected clones. This segmentation allows the bulk of cells to be screened efficiently while maintaining detection precision for the few positive cases.
Solution Approach 2:
The invention introduces an intermediary substance (antigen or antibody) that mediates between the lymphocytes and the detection system. By coating wells with these substances and detecting binding events, the system converts the difficult direct detection of antigen specificity into an easier indirect detection of binding interactions, enabling both high throughput and precision.
2Productivity
If simultaneous measurement of large numbers of cells is performed, then productivity is improved, but device complexity increases due to the need for new detection systems
Solution Approach 1:
The invention creates a simplified copy of the cell detection problem by using well plates as containers and coating substances as proxies for cellular activity. Instead of directly measuring complex cellular processes, the system measures the binding of coating substances to secreted antibodies, which provides a simpler, more measurable signal that enables simultaneous analysis of many cells.
Solution Approach 2:
The invention replaces complex mechanical cell-by-cell analysis with a chemical/biological detection system. By using antibody-antigen binding interactions and detection reagents, the system substitutes mechanical manipulation and visual inspection with chemical reactions that can be measured en masse, thereby increasing productivity without requiring complex mechanical sorting devices.
3Quantity of substance
If hybridomas are cultured in large numbers without simultaneous checking, then quantity of cells increases, but reliability decreases as cells may die from nutrient depletion
Solution Approach 1:
The invention enables continuous monitoring of hybridoma growth and antibody production through the coating layer detection system. By periodically checking binding events in the well plates, the system maintains continuous observation of cell health and productivity, allowing for timely intervention to prevent nutrient depletion and cell death while maintaining large-scale culture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method allows for the simultaneous measurement of the states of thousands to hundreds of thousands of cells, enabling efficient detection and recovery of antigen-specific antibody-producing cells, overcoming the limitations of low frequency and low production rates, and improving the screening process.
Implementation Method 1
immersing the coating layer and the wells in the culture solution and culturing the cells in a state permitting the diffusion of a substance contained in the culture solution into the coating layer
Implementation Method 2
feeding a label substance binding specifically to a substance produced by a target cell present among the specimen cells onto the coating layer; and detecting the substance produced by the target cell that has bound to the substance in the coating layer by means of the label substance
Data Source
AI summary
Provided are a method and means permitting the simultaneous measurement of the reactive properties of more than 10,000 of antigen-stimulated lymphocytes being held on a chip and the separate determination of the states of individual cells. A microwell array comprises multiple wells and a coating layer on one of the principal surfaces of a base member, the wells being of a size permitting the entry of only a single cell into each well. A coating layer of a substance capable of binding to a substance produced by the cells contained in the wells is present on the principal surface around the wells. A method of screening for a target cell, comprises: causing specimen cells and a cell culture broth to be contained in the wells of the above microwell array; immersing the coating layer and the wells in the culture broth and culturing the cells in a state permitting the diffusion of substances in the culture broth from the wells into the coating layer; feeding a label substance binding specifically to a substance produced by a target cell present among the specimen cells onto the coating layer; and detecting the substance produced by the target cell that has bound to the substance in the coating layer by the label substance to specify the target cell.